Cellular usage on Apple Watch Series 7 draining battery rapidly

Hello,

In my aw7, when opening the cellular, the battery just running out in seconds. For example, I opened the cellular during a walk and tried to make a call and it flew from 85% percent to 10% and the watch shut down. It happened a few times, so i avoid using cellular. Without cellular, the battery holds for about 12 hours. Has someone experienced this? Solution?

Thanks in advance

[Re-Titled by Moderator]